Correction: Interior Photography of Sewers

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  • Correction: Interior Photography of SewersSource: Sewage and Industrial Wastes, Vol. 30, No. 12 (Dec., 1958), p. 1495Published by: Water Environment FederationStable URL: .Accessed: 16/06/2014 04:56

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  • Vol. 30, No. 12 PREDACIOUS FUNGI 1495

    after chlorination, one unit showed an

    increase in effluent oxidized nitrogen. The remaining four showed a similar increase four days later. Apparently, chlorination resulted in a major de crease in the population of nitrifying organisms. Their slower regeneration period resulted in a much longer re

    covery time than for other active or


    Sludge Condition

    Activated sludge effluents remained in poor condition during the chlorina tion period. Suspended solids ranged from 20 to 40 mg/1. Mixed liquor solids continued to decrease slowly.

    Only one to two days were required after discontinuance of chlorination to obtain a clear effluent. Mixed liquor solids began a rapid rise about two

    weeks after chlorination.

    Effect on Nitrile-Consuming Organisms

    Nitrile assimilation was undeter mined during the period of upset and

    recovery because of the nitrogen im balance resulting from sludge destruc

    tion. As soon as oxidized nitrogen in

    the effluent exceeded nitrogen entering in sewage, nitrile nitrogen oxidation became evident, occurring in one test

    unit during the second week after chlorination and, in the three remain

    ing units, during the third week after chlorination.

    It was apparent that nitrile-consum

    ing organisms were not completely de

    stroyed by the upset or by subsequent chlorination. Although up to 11 weeks

    were required to acclimate a new

    sludge to nitrile oxidation, all four test units were effectively metabolizing nitriles within three weeks after chlo rination.


    Chlorine dosage used to correct the wild growth apparently was greater than necessary to accomplish the de sired effect. Fewer applications at a lower concentration probably would have destroyed the fungus without

    seriously affecting nitrifying organ isms.

    In Units 6 and 7, which were not

    chlorinated, Zoophagus was still evi dent at a time when the chlorinated units were producing good effluents. The mold was disappearing slowly as if running out of food or because of the large increase in copepods. It is

    likely that the population balance would have been restored eventually in the test units without treatment but

    good effluents were obtained two to four weeks earlier in the chlorinated units.


    Photomicrographs, at X 450, were taken by E. N. Bloomhuff.


    1. Duddington, C. L., "The Predacious Fungi and Their Place in Microbial Ecol

    ogy." Cambridge University Press, New York, N. Y. (1957).


    In the paper, "Interior Photography of Sewers" (This Journal, 29, 12, 1398; Dec. 1957), the text description on page 1403 referring to Figure 6 is in error in identifying the pipe in the photograph as

    being made of vitrified clay. This is an interior photograph of a 36-yr old, 17-in. diameter, concrete pipe.

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    Article Contentsp. 1495

    Issue Table of ContentsSewage and Industrial Wastes, Vol. 30, No. 12 (Dec., 1958), pp. 479a-502a, 1443-1534, ix-xxviii, 503a-518aVolume InformationFront MatterSewage WorksSewage Treatment Plant Costs in Kansas [pp. 1443-1454]Enteric Viruses and Salmonellae Isolation: II. Media Comparison for Salmonellae [pp. 1455-1460]Statistical Summary of Sewage Chlorination Practice in the United States [pp. 1461-1468]Survival of Salmonella Typhosa during Anaerobic Digestion: I. Experimental Methods and High-Rate Digester Studies [pp. 1469-1477]

    Industrial WastesSoil Adsorption of Radioactive Wastes at Los Alamos [pp. 1478-1489]Predacious Fungus Behavior in Activated Sludge Systems [pp. 1490-1495]

    Correction: Interior Photography of Sewers [p. 1495-1495]Stream PollutionAeration of Stream Flow at Power Turbines [pp. 1496-1505]

    The Operator's CornerOperator Ingenuity at the Tacoma, Washington, Sewage Treatment Plant [pp. 1506-1518]Work Area Protection [pp. 1518-1521]Tips and Quips [pp. 1522-1523]

    News and Notes [p. 1524-1524]Federation AffairsWilliam D. Hatfield New President [pp. 1525-1526]Mark D. Hollis Elected Vice-President [pp. 1526-1527]Detroit Hosts Thirty-First Annual Meeting [pp. 1527-1530]Detroit Board of Control Meetings [pp. 1530-1534]

    Proceedings of Member Associations [pp. 504a, 506a, 508a]Back Matter